Aie-inxet attachment fob cokbtjstioet



June 4, 1929. F'. SETTE 1,715,516

AIR INLET ATTACHMENT F OR COMBUSTION CHAMBERS Filed Sept. 14} 1927 2 Sheets-Sheet 1 BY M wwv mwz ATTORNEYS June 4, 1929. SETTE 1,715,516

AIR INLET ATTACHMENT FOR COMBUSTION CHAMBERS Filed Sept. 14, 1927 2 Sheets-Sheet 2 INVENTOR Patented June 4, 19229.

NETED STATES FRIEDERICK SETTE, OF DETROIT; MICHIGAN.

AIR-INLET ATTACHMENT FOB COMBUSTION"CHAMBERS.

Application filed September 14,1927. Serial No. 219,375.

My invention relates to inuorovements in air inlet attachments for combustion chambers.

The object of this invention is to provide 5 simple, inexpensive and effective means for heating and distributing air over the sur faces of a mass of burning fuel at a temperature and in. a manner to promote effective combustion of gases emanating from said 1 fuel.

I am aware of the fact that numerous attempts have been made to provide devices for heating and distributing air over the surfaces of burning fuel in stoves and furnaces, but such devices, as heretofore used, have had lined points of air delivery and in asmuch as the level of the fuel in the fire pot of astove or furnace varies considerably in accordance with the practice ofthe user or with changing seasons or conditions of exte rior. temperature, such air inlets are at times covered by the fuel and are at other times so far above the level of the fuel in the fire pot as to operate as checks. to combustion instead of as aids to combustion.

More specifically, stated, therefore, it is my object to provide an adjustable air inlet, the position of which may be quickly and easily changed in such a manner that. the air will be delivered directly over the sur face of the fuel, the device being adapted to utilize the heat of the fuel to bring the temperature of the air, preparatory to its delivery,to a degree which, will promote instantignition of thecombustible gases instead of reducing their temperature, or the temperature of the exposed. fuel, to a point where combustion becomes uncertain. A further object of my invention is to provide simple means for supporting the attachment from the doors of stoves or furnaccsof different sources of manufacture with consequent difference in contour, thickness and other structural variations.

In the drawings: V I Figure 1 is a side elevation of a furnace to which my invention has beenapplied, a portion of the furnace wall being broken away in vertical section to expose the attachment in its relation to the fire pot, the attachment being illustrated by full lines in one position and by dotted lines in another position of adji ment.

attachment partly in elevation and partly in vertical section.

Figure 3 is a vertical sectional View of the attachment drawn to a plane which includes its central axis and the aXis of the distributing nozzle.

Figure 1 is a detail viev: of the inner wall of the distributor showing-its interior face;

Figure 5 is a sectional view drawnon line 55 of Figure 3.

Figure 6 is a view similar to Figured obvious that the plate 10 may have its hub 11 clampedagainst the door'member B by turning up the nut 13 against the outer face of the door member A. An air distributing plate 16 is secured to the supporting plate 10 by belts or rivets 17 andits inner face is channeled to provide one or more air passages 18 which maybe spirally arranged as 7 shown in Figure 4, whereby air entering through the nipple 12 may be directed along a spiral path to an outlet port 19 adjacent to the periphery or outer margin of the platelG. u

The port 19 opens disk on the inner side, i. e.--on the side opposite plate 10 and receives a tubular nozzle stem 20 having thereona suitable nozzle head 21 provided wit-h a spherically curved end wall 22 in which anarcuate slot 23 is provided through which air may escape to the combustion chamber of the furnace. ithlnthe nozzle head there 1s a transverse through thew-all of the partition wall 525 near the margins ofwhich,

along the cylindrical wallefthe nozzle head 21, are arcuate slots .ZGJL-hrough which air may pass from the cavity 27 in the inlet'portion of the headto the cavity 28 in the out- "lhe nozzle head maybe rotaton. the shank 20, being t1 1 win the head for the purpose hereinafter explained.

The plates 10 and 16 with the attached nozzle may be rotatably adjusted upon the centrally disposed supporting nipple 12. Ordinarily the clamping pressure of the hub 11 on the plate B will not be sutlicient to prevent the plate 10 from being rotated manually. If the resistance is too great, the nut B will be slightly loosened to permit such rotation. The rotative movement of the plates 10 and 16 causes the shank 2t) and the nozzle head to travel in a circular path, whereby the nozzle head may be adjusted at various elevations in a vertical plane. After each adjustment, the nozzle head will preferably be rotatably adjusted about its own axis in order to position the arcuate slot 23 in a horizontal plane so that the air will be delivered and distributed in a horizontal plane over the surface of the fuel. \Vhen the stove or furnace is being run with the fuel at a low level in the fire pot, i. e.,a little above the tire brick lining C thereof, the attachment and the nozzle head will be adjusted as indicated by dotted lines in Fig ure 1. But when the fire pot is being oper-- ated. with a greater quantity of fuel, the nozzle head will be adjusted at a higher level, its maximum height being indicated by full lines in Figure 1.

Air entering the combustion chamber through the attaclnnent will absorb heat from the plates 10 and 1.6, the outer surface of the latter being preferably corrugated or ribbed as shown in Figure 3 to promote heat absorption. The air will absorb additional heat in its passage through the shank 20 and the nozzle head 21, such heat absorption being promoted by the partition 25 which checks the rapidity of the flow and causes the air to follow a circuitous path along the interior surfaces of the nozzle head as it passes through the slots 26 into the cavity 28. 'lherefore when the air passes through the outlet 23, it will have a ten'iperature nearly equal to the temperature of the atmosphere above the fuel in the combustion chamber inasmuch as the walls of the attachment are all located within the combustion chamber, only the outer end of the nipple 12 being exposed exterior to the door. Owing to the arcuate form of the slot 23, the incoming air is distributed in a thin, fan-shaped sheet along lines radiating in a horizontal plane substantially from the center of the cavity 28. Such air, when delivered in close proximity to incandescent fuel or to fuel from which gases are escaping at a high temperature, will instantly mix with such gases without reducing their temperature to a point where combustion will be prevented. Such gases will therefore spontaneously ignite or be ignited by the burning fuel, and if air is admitted in the proper proportion, complete combustion will result.

It will be understood that the size of the heating chamber or passage formed between the plates 10 and 1t and also the capacity of the nozzle will be proportioned as nearly as may be practical to the capacity of the stove or furnace to which it is to be applied, thereby supplying the correct quantity of air for the promotion of combustion under normal conditions of operation and with the nozzle located at the proper height above the fuel. I do not intend to be understood as implying that my attachment is to be adjusted from day to day in accordance with the level. of the fuel in the combustion chamber, although this may be done if the operator so desires. Ordinarily, however, the attachment will operate satisfactorily if an adjustment is made whenever, on account of changing weather conditions or otherwise, a change is made in the practice of stoking, i. e.,-in the level to which the combustion chamber filled with fuel during furnace feeding. operations.

In the modification shown. in Figure 6, a plate 16, correspomling generally with the plate 16 shown in Figures 3 and 4, is provided on its inner face with a 'ieripheral rib or flange 30* which abuts the plate 10 as does the outer flange 30 in Figures 3 and 4. A concentric arcuate flange 31. partially encircles the aperture into which the nipple 12 is screwed and an intermediate concentric arcuate flange 32 partially encircles the flange 31, the gap 33 between the ends of the flange 32 being on the opposite side of the center from that occupied by the gap 34 between the ends of the flange 31. These flanges 31 and 32 also abut plate 10, whereby air entering through the tubular nipple 12 is caused to pass in a generall circular path through the cavity between the flanges 31 and 32 to the gap 33 and then in the space between the flanges 32 and St) to the outlet 19 through which it is delivered to the nozzle as above described with reference to the other views.

It will be observed that the rib 30 in Figure 3 and the rib 30 in Figure 6 are provided with circular flanges 35 and 35 respectively, which fit over the periphery of the disk 10. This feature is not essential inasmuch as it is not n cessary that the chambers should be air-tight. But with the construction illustrated, they will be sutliciently air-tight for all practical purposes even though the parts comprise unfinished castings.

The nipple 12 may be of any desired length to suit the requirements of doors of ditl'ering thickness. he threaded end portions are of a length to allow the door to be clamped by the nut in any event and inasmuch as the plates and nozzle are wholly supported by the nipple, the attachment may easily be secured to any stove or furnace door and clampinglyengaged therewith.

My attachment can be installed and corn i'iected with. the door of any hot air furnace or boiler heater in a position to deliver hot air over the surface of the fuel. In hot air furnaces the fire pot is much deeper than it is in boiler furnaces and in hot air furnaces the sur ace of the fuel will, as a rule, not be above the bottom of the door opening.

The combustion of gas and smoke takes place on the surface of the fuel and, therefore, the positionof the nozzle as shown in l igure 3 will be the desirable one under such conditions.

ln boiler heaters the fuel surface is usually above the bottom of the door opening and in such cases the disks or air heating at the desired level. i

In the hot air furnaces the side wallsof the door openings extendjinwardly from 8 to 12 inches, whereas in boiler heaters these side walls and door plates extend inwardly from but 4;t0 8 inches when constructedin accordance with common practice. The nipple 20 will, therefore, be made long enough and threaded throughout a considerable portion of its length to enable the nozzle to be adjusted to suit these varying conditions.

In firing a furnace or boiler heater equipped with the device the live coal should be kept at the front of the lire pot and not covered with'fuel in order that there may be incandescent fuel in a position to ignite the gases generated underneath or in the lower portion of the freshly fed fuel.

I claim:

1. An air feeding attachment for stoves and furnaces comprising a chambered member adapted to be rotatably and adjustably clamped to a support within a combustion chamber, in cm'nbination with means for feeding air into said member along its axis, said member having an outlet for delivery of air, distant radially from said axis but being otherwise closed and interiorly pro vided with partition walls which require the air to circulate along predetermined paths over all of the interior surfaces of said member before reaching the outlet, said member being rotatab'ly adjustable to vary the level of the outlet without otherwise changing the course of the air. a

2. An air feedh'ig attachment for stoves and furnaces comprising a disk-like chambored meml'ieradapted to be rotatably and adjustably clamped to a support within a combustion chamber, in combination with means for feeding air into said member along its axis, and means fordelivering air abcwe thefael in said. chamber at a distance from said axis and at level determined by the rotative, adjustment, said air delivering means having a rotatable outlet nozzle ex tending parallel to the axis and provided with a slotted spherically curved wall.

3. An air feeding attachment for stoves and furnaces, comprising the combination of a set of platessecured together and formed to provide a heating chamber between them, one of said plates being provided with a flange subistantially abutting the other plate and. defining a spiral passageleading outwardly from the axis to the peripheral portion of such plate, a tubular supporting inlet member centrally secured to one of the plates and affording communication with the space between them, and an outlet nozzle for said chamber, said outlet nozzle being positioned for delivery of air from the being rotatably adjustable upon the inlet .member to position the nozzle at different levels in a vertical plane. v

4. An air feeding attachment for stoves and furnaces, comprising the combination of a set of plates secured together and formed to provide a spiral heating chamber between. them, said heating chamber having the form of a passage leading outwardly from the axis to a point near the outer margins. of the plates, a tubularsupporting inlet member centrally secured to one of the plates and affording communication with the space between them at the inner end of said passage, and an outlet nozzle for said chamber at the outer end of said passage, said platesbeing rot-atably supported by and adjustable upon the inlet member to position the nozzle at different levels in a vertical plane, and said nozzle being rotatable about" nipple progressively outwardly along the interior wallsof said chamber to an outlet port adjacent to its outer margin, said port being located in the inner wall of said chambernear itsouter margin.

6. The combination with the door of a heater, of a tubular air inlet'nipple extend ing therethrough, a disk shaped air heating chamber rotatably mounted upon the inner 7 end of said nipple in close proximity to the door and provided with a continuously curving passage leading from thenipple progl'GF-iSlVGly outwardly along the interior walls of said chamber to an outlet port ad jacent to its outer margin, said port being" located ire-"the inner wallet chamber its outer margin, said port being, K

to its axis and provided with an outlet port 10 radially distant from the axis of the nipple, a nozzle rotatably mounted in said outlet port substantially parallel to the axis of the nipple and provided with means for delivering air substantially in a fan-shaped 15 stream.

FRIEDERICK SETTE. 

